Handle EventDispatcher response body reads errors correctly

[pierDipi]

Fixes #

Proposed Changes

• Handle EventDispatcher response body reads errors correctly
• Simplify code logic

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pierDipi

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [pierDipi]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 67.64%. Comparing base (43cf75a) to head (a78324d).

Files	Patch %	Lines
pkg/kncloudevents/event_dispatcher.go	50.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8006      +/-   ##
==========================================
- Coverage   67.65%   67.64%   -0.01%     
==========================================
  Files         361      361              
  Lines       16638    16631       -7     
==========================================
- Hits        11256    11250       -6     
- Misses       4690     4692       +2     
+ Partials      692      689       -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.